High charging, but new interior harness?

Yes I checked it with my voltmeter with car off, key on and running.
I also tried to find any voltage drop with the key on at the various spots and couldn't really find any major drops.

Will go through the options @Mattax listed in the last post there.

I guess it should be noted when I first start the car it goes from 13.8 and slowly works up to 15.1. I will also take a drive tomorrow and see if as the engine bay warms up the voltage regulator starts bringing it down a bit.